package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.CacheClient;
import com.hmdp.utils.RedisConstants;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result queryTypeList() {
        // key
        String key = RedisConstants.SHOP_TYPE_KEY;

        // 缓存是否存在
        String json = stringRedisTemplate.opsForValue().get(key);
        if (StrUtil.isNotBlank(json)){
            // 存在
            List<ShopType> shopTypes = JSONUtil.toList(json, ShopType.class);
            return Result.ok(shopTypes);
        }

        if (json != null){
            // 避免缓存穿透
            return Result.fail("不存在店铺分类列表!");
        }

        // 缓存 “”
        List<ShopType> shopTypes = this.query().orderByAsc("sort").list();
        if (shopTypes == null){
            stringRedisTemplate.opsForValue().set(key, "", 10L, TimeUnit.MINUTES);
            return Result.fail("不存在店铺分类列表!");
        }


        stringRedisTemplate.opsForValue().set(key, JSONUtil.toJsonStr(shopTypes),
                                            10L, TimeUnit.MINUTES);

        return Result.ok(shopTypes);
    }
}
